Pagination with AutoMapper

I recently posted a method of using AutoMapper in an ActionResult (http://bzbetty.blogspot.co.nz/2012/06/thoughts-on-actionfilters.html).  This became an issue when I was trying to return a paginated model to the view, as I wanted to do pagination in the database (on the entities) but AutoMapper had no idea how to map the IPagination result to the ViewModel.

Result - Build a custom IObjectMapper to do the mapping


Resulting Action

	[AutoMap(typeof(EventListViewModel))]
	public ActionResult Index(int? page)
	{
	page = page ?? 1;
	var entities = //load data from database
	.AsPagination(page.Value, 20); //pagination method from MVC Contrib
	return View(entities);
	}

view raw automap.cs hosted with ❤ by GitHub

IObjectMapper

	public class PaginationMapper : IObjectMapper
	{
	private IMappingEngineRunner _mapper;
	public T Map<T>(object source)
	{
	TypeMap typeMap = _mapper.ConfigurationProvider.FindTypeMapFor(source, source.GetType(), typeof(T));
	MappingOperationOptions mappingOperationOptions = new MappingOperationOptions();
	ResolutionContext resolutionContext = new ResolutionContext(typeMap, source, source.GetType(), typeof(T), mappingOperationOptions);
	return (T)_mapper.Map(resolutionContext);
	}
	public PagedList<T> CreatePagedList<T>(IPagination source)
	{
	var result = Activator.CreateInstance<PagedList<T>>();
	result.TotalItems = source.TotalItems;
	result.TotalPages = source.TotalPages;
	result.HasNextPage = source.HasNextPage;
	result.HasPreviousPage = source.HasPreviousPage;
	result.PageNumber = source.PageNumber;
	result.PageSize = source.PageSize;
	result.FirstItem = source.FirstItem;
	result.LastItem = source.LastItem;
	foreach (var item in source)
	{
	result.Add(Map<T>(item));
	}
	return result;
	}
	public object Map(ResolutionContext context, IMappingEngineRunner mapper)
	{
	_mapper = mapper;
	Type destinationType = context.DestinationType.GetGenericArguments()[0];
	var method = typeof(PaginationMapper).GetMethod("CreatePagedList").MakeGenericMethod(destinationType);
	return method.Invoke(this, new[] { context.SourceValue });
	}
	public bool IsMatch(ResolutionContext context)
	{
	return typeof(IPagination).IsAssignableFrom(context.SourceType) && typeof(IPagination).IsAssignableFrom(context.DestinationType);
	}
	}

view raw pagination.cs hosted with ❤ by GitHub